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Mathematics 9 Online
OpenStudy (anonymous):

The Sahara Desert covers about 8.3 x 1013 (that's 10 to the 13th power) square feet. The average depth of the sand in the Sahara Desert is 200 feet. A grain of sand has a volume of approximately 1.3 x 10to the -9 power cubic feet. Which of the following is the best estimate of the number of grains of sand in the Sahara Desert? The answer is 10 to the 25th power. How did they get this answer?

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